Propeller



UNITED sTATEs PATENT oEEioE.

C. J. SCHVEDER, OF ASTORIA, NEW YORK.

PROPELLER.

Specification of Letters Patent No. 30,355, dated October 9, 1860.

To all whom 'it may concern:

Be it known that I, C. J. SGHVEDER, of Astoria, in the county of Queens and State of New York, have invented a new and Improved Propeller; and I do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the accompanying drawing, forming a part of this specification, in which- Figure l represents a longitudinal vertical section of my invention. Fig. 2 is a trans verse vertical section of the same, taken in the plane indicated by the line 0c, zc, Fig. l, and looking in the direction of the arrow opposite to that line.

Similar letters of reference in both views indicate corresponding parts.

To enable those skilled in the art to make and use my invention I will proceed to describe it with reference to the drawing.

My propeller is secured to the stern A, of a boat or vessel by means of a stationary shaft or stem B, which is rigidly attached to the vessel by means of flanges a, or in any other convenient manner. Rigidly fastened to the front end of this shaft is the collar C, and braces o, steady the position of the shaft and collar. The collar C, forms the support for the frame D, on which the folding sheet E is stretched. This frame consists of a series of bars, c, cl, the upper bars c, being hinged to the collar C by means of a wire e, and the lower bars cl, being secured to the bars c, by means of pivots f. The bars c, extend from the collar C, in a radial direction as clearly shown in Fig. 2, and if left in this position the sheet E is perfectly stretched. But if the bars c, are turned up so that they assume a position parallel to the shaft B or nearly so, the outer ends of the bars are brought close together and the sheet E is caused to fold up so that by imparting an oscillating' motion to the frame D, the sheet E assumes a motion similar to the footof a duck or toad in swimming. The lower bars d, are so arranged that in swinging from the stern of the vessel, they are rigid with the bars c, but in swinging toward the stern they are allowed to turn up in line with the direction in which the motion takes place, whereby the resistance of the water on the folding sheet during its receding motion is considerably diminished. If it is desired however to use the propeller for backing, the bars d have to be attached by reversible stops, so that they can be made rigid in either direction.

Motion is imparted to the frame D, by means of a reciprocating rod F, which connects with the sleeves Gr, H, the sleeve Gr, being pivoted to the end of said rod and the sleeve H, being attached to it by means of the lever joint g. The sleeve H, connects by means of a series of stay rods it, with the bars c, of the frame D and the sleeve G, connects by means of 'rods or braces i, with the stay rods 7L, said braces being secured tothe stay rods by means of pivots as clearly shown in Fig. l in the drawing.

The stay rods a, and the braces z', are connected to the sleeves Gr, H, by means of wires or pivots y', 76, and if now a reciprocating motion is imparted to the sleeves G, H, the frame D, together with the folding sheet- E assumes an oscillating motion and the sheet is alternately folded up and expanded, causing the same to act on the water in one direction and allowing it to pass through the water with comparatively little resistance in thel other direction. By the use of the hinged bars (Z, the resistance in one direction is considerably increased without materially increasing the resistance of the propeller in the opposite direction, and by the employment of two sleeves and by the arrangement of the braces c', in connection with the stay rods it, the entire frame is rendered firm and durable so that it can not easily get out of order.

Having thus fully described my invention what I claim as new and desire to secure by Letters Patent, is-

The arrangement of the rod F, lever g, rods h and braces z', with the two sleeves G H, bars c, l and sheet E as and for the purposes herein shown and described.

C. J. SCHVEDER.

Witnesses C. W. CowTAN, L. W. BENDR. 

